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Memcached – Flush Contents Of a Server Using Command Line

You can invalidate all existing cache items using the flush_all command. This command does not pause the server, as it returns immediately.
It does not free up or flush memory at all, it just causes all items to expire.

netcat (nc) Command Example

The nc (netcat) command is a simple unix utility which reads and writes data across network connections, using TCP or UDP protocol.
It can simply connect to the memcached instance and and invalidate all existing cache: